Miscellaneous docstring and comment edits

[dandavison]

I only did this because I spotted one s/signal/update/ copy-paste error, but then I felt I should do a bit more editing to make the PR a more respectable size. The set of files looked at here is essentially random (they appeared close together in a file browser).

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Note

Refines Javadocs across workflow dynamic handlers and package docs to mention updates and improve grammar, and fixes an error-message typo in ExternalWorkflowStub.

• Docs/Javadocs
  • Clarify wording and grammar in DynamicQueryHandler, DynamicSignalHandler, DynamicUpdateHandler, and DynamicWorkflow (e.g., library-level phrasing, DSL description, and “updates” vs “signals”).
  • Update workflow/package-info.java to explicitly mention updates alongside signals and improve phrasing in multiple sections.
• Bug Fix (typo)
  • Correct error message text in ExternalWorkflowStub#fromTyped ("sbub" → "stub") and minor grammar in class Javadoc.

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[Quinn-With-Two-Ns]

For CI to pass you need to rebase. Your code is to far behind the github actions

[dandavison]

Sorry I forgot about this. I'll hit merge now because it's green and I think that was your intention and usually the author merges.

[Quinn-With-Two-Ns]

Yep, just cleaning up old open PRs